Theory of Cryptography Third Theory of Cryptography Conference, TCC

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos New York University, NY, USA Doug Tygar University of California, Berkeley, CA, USA Moshe Y. Vardi Rice University, Houston, TX, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Shai Halevi Tal Rabin (Eds.)

Theory of Cryptography Third Theory of Cryptography Conference, TCC 2006 New York, NY, USA, March 4-7, 2006 Proceedings

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Volume Editors Shai Halevi Tal Rabin IBM T.J. Watson Research Center 19 Skyline Drive, Hawthorne, NY 10532, USA E-mail: [email protected]; [email protected]

Library of Congress Control Number: 2006921180 CR Subject Classification (1998): E.3, F.2.1-2, C.2.0, G, D.4.6, K.4.1, K.4.3, K.6.5 LNCS Sublibrary: SL 4 – Security and Cryptology ISSN ISBN-10 ISBN-13

0302-9743 3-540-32731-2 Springer Berlin Heidelberg New York 978-3-540-32731-8 Springer Berlin Heidelberg New York

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. Springer is a part of Springer Science+Business Media springer.com © International Association for Cryptologic Research 2006 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 11681878 06/3142 543210

Preface TCC 2006 was the third Theory of Cryptography Conference, which was held at Columbia University in Manhattan, New York, March 4-7, 2006. TCC 2006 was sponsored by the International Association for Cryptologic Research (IACR) and organized in cooperation with the Computer Science Department of Columbia University. The local arrangements chair was Tal Malkin. The Program Committee, consisting of 13 members, received 91 submissions and selected for publication 31 of these submissions. The quality of the submissions was very high, and the selection process was a challenging one. The proceedings consist of the revised versions of these 31 papers. Revisions were not checked as to their contents, and the author